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    Université de Neuchâtel

    M and N core excitations in zirconium

    Vanini, F. ; Erbudak, M. ; Aebi, Philipp ; Kostorz, G.

    In: Physical Review B, 1990, vol. 42, no. 10, p. 5984-5989

    The structures in the electron-energy-loss spectra for the long-lived 3p, 3d, and 4s core excitations in clean zirconium are accounted for by the unoccupied density of states. Transitions to final states with different angular momenta are observed. The short-lived 4p excitations can only be understood in terms of an atomic theory given by Fano that treats excitation...

    Université de Neuchâtel

    Electronic excitations in the transition metals V, Zr, Nb, Mo, and Ta

    Cornaz, A. ; Erbudak, M. ; Aebi, Philipp ; Stucki, F. ; Vanini, F.

    In: Physical Review B, 1987, vol. 35, no. 7, p. 3062-3068

    The np core-loss spectra and the associated deexcitation processes for the transition metals V (n=3), Zr, Nb, Mo (n=4), and Ta (n=5) have been studied in low-energy electron scattering experiments in order to investigate the dependence of their nature on the principle quantum number n. For the metals with n=3 and n=4, the measurements are accounted for in...

    Université de Neuchâtel

    L2,3 edge of silicon: Theory and experiment

    Aebi, Philipp ; Keller, J. ; Erbudak, M. ; Vanini, F.

    In: Physical Review B, 1988, vol. 38, no. 8, p. 5392-5396

    Structures in the electron-energy-loss spectrum up to 30 eV above the L2,3 edge of clean silicon, excited with high- and low-energy electrons, are found to be in good agreement with a multiple-scattering calculation of the empty density of states of a tetrahedral cluster of 17 silicon atoms. The relaxation of the excited atom is investigated by means of the emission...

    Université de Neuchâtel

    L and M edges of copper: Theory and experiment

    Aebi, Philipp ; Erbudak, M. ; Vanini, F. ; Vvedensky, D. D. ; Kostorz, G.

    In: Physical Review B, 1990, vol. 41, no. 17, p. 11760-11769

    Characteristic electronic transitions and the associated fine structure in the near-edge region are investigated with electron-energy-loss spectroscopy for the copper L and M edges. In a single-particle scattering picture this fine structure represents the unoccupied density of states selected by the matrix elements. However, electronic processes can often complicate this simple...

    Université de Neuchâtel

    Nondipole channels in the electron-energy-loss structure near the 3s edge of copper

    Aebi, Philipp ; Erbudak, M. ; Vanini, F. ; Vvedensky, D. D. ; Kostorz, G.

    In: Physical Review B, 1992, vol. 42, no. 8, p. 5369-5372

    Electronic transitions near the 3s edge of copper are investigated with electron-energy-loss spectroscopy and compared with real-space multiple-scattering calculations. Calculating the generalized oscillator strength illustrates the importance of dipole-forbidden transitions in the near-edge region and shows for the first time the feasibility of making detailed comparisons between theory...